Abstract
An improved laser fluorimeter and its application for the determination of ultratrace concentrations of uranium are described. The system developed uses a collecting lens-filter system, by which the density of laser radiation on the sample is increased greatly and the interfering stray light can be reduced to a great degree. In addition, both laser and lamp sources are joined together in the instrument. A strong green phosphor from uranium-doped sodium metaphosphate (NaPO3: U) has been found suitable and has been used for the determination of ultratraces of uranium. A detection limit (3σ) of 0.36 pg of uranium (in 30 mg NaH2PO4 per pellet) was obtained. In the case of peak-to-background intensity ratios relative standard deviations (RSD) are 6.4% and the linear dynamic range extends from 1 pg to 103 ng of uranium.
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Zhang, R., Lin, Y. & Cheng, J. An improved laser fluorimeter for the detection of traces of uranium. Mikrochim Acta 97, 365–372 (1989). https://doi.org/10.1007/BF01242259
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DOI: https://doi.org/10.1007/BF01242259